5. accessing the 2nd bolt on the coolant pipe is a PITA. First, unplug the two large engine electrical plugs. Then use a torx bit (I think a T-20) to remove the lower plug from the metal mount. Next LOOSEN but DO NOT REMOVE the bolt that is under the intercooler tube near the firewall that holds the electrical connectors to the head (see picture below)
6. Now remove the two remaining bolts holding the electrical connector bracket down.
7. With those two removed and the third loose you should be able to wiggle the bracket out of the way enought to loosen the 2nd bolt holding the coolant pipe to the head.
8. Now gently wiggle the thermostat cover loose, you may need to give it a light tap with a RUBBER hammer. I decided not to unattach the black coolant pipe from the thermostat housing, I was able to work around it. You can if you want, it's your choice. Once the thermostat housing is removed you will be able to see the thermostats.
9. Take the two old thermostats out and be sure to clean out all of the old rubber gaskets on the thermostats.
10. Install the new thermostats (the longer one in the front) and reinstall. Make sure the drain holes on the thermostat are to the rear of the truck.
Remove the bleeder screw on top of the thermostat housing (circled in picture).
Add coolant to the coolant tank on the passenger side between the air box and battery. Mine took about 3/4 of a gallon.
When full, coolant will come out of bleeder screw, when this happens, replace bleeder screw and top off tank to appropriate level.
Hope that helps! It's a pretty easy task, only takes about 1 1/2 beers